Answer

Is the fired case in the chamber? In the ejection port? Laying on top of the feeding round? Does the extractor hold correctly? Is it tearing thru the case rim or letting go? Is the chamber rough and dirty and pitted? What shells are the customer using, handloads? Factory loads?

Reply:

Extractor, sometimes it is laying on top of the next round. But the majority is, it is still in the extractor and re-feeds into the chamber. The extractor holds the round very well; there is no damage to the casing, unless it is laying on the next round. There is not tearing or marking on the rim. The chamber is in good condition, not dirty or pitted. The shells used to fire are surplus military ammo, 7.62 x 51 ball.

Answer:

OK good, we know the extractor is working so let’s look at the ejector. Make sure it has full depth in the ejector slot in the bolt face. If it doesn’t that may be your culprit. The bolt with case comes back and the case slips by the ejector some how. Look into that. It may also be that the gun is short cycling. Make sure the bolt and all the parts work smoothly with one another. Make sure the bolt doesn’t drag in the receiver. Ken

Reply:

Very good, but how do you check that. The ejector works when you manually do it, it is only when you fire the gun that it does not work. I also think it has something to do with the Ejector. On the short cycling how do you check that, that sounds like another possibility?

Answer:

Move the bolt to the rear slowly and when the ejector is up in position, before it would hit the shell it should have good depth or engagement in the ejector slot in the bolt. Then with the ejector flush with the breech face make sure you cannot force it away from the breech face so the shell MUST hit the ejector. As far as short cycles put two shells in the mag. and shoot one and see if the MT stays on the breech face under the extractor and the live round will be trying to feed out of the magazine.